Internal-combustion engine



K. EISENBURGER INTERNAL COMBUSTION ENGINE Nov. 25, 1930.

VIII/Ill,

@fl/lll Filed Dec.

so Figure 1.

Patented Nov..- 25, 1930 v UNITED s'rATEsPA-TENT oFFlcE KUNO EISENBURGER, 0F BISTRITA, RUMANIA, ASSIGNOR TO THE FIRM 0F SULZER FRBES SOCIT ANONYME, 0E' WINTERTHUR, SWITZERLAND Application led December 16, 1929, Serial No. 414,551, and in Switzelaand December 13,

This invention relates to internal combustion engines operating on the four-stroke cycle and has particular reference to such engines in which air is admitted into the working cylinder through valves disposed in the cylinder head and also through ports controlled bythe piston.'

According, to this. invention at the beginning` of the exhaust strokeair is admitted from the piston controlled ports with a circular or whirling motion into a trough-like depression in the piston head, so that after the waste gases have been driven out there is provided above the piston a layer of pure air which will assist combustion at theO next power stroke, e

Conveniently one or more non-return valves are provided through which the air passes to the piston controlled inlet ports and this `air may besupplied at a higher pressure than the air supplied through the ports disposed in the cylinder head.

The inventlon maybe carried into practice 1n various ways but one construction of an internal combustion engme arranged according thereto is diagrammatically illustrated in the accompanying drawings, in which Fig. 1 is a longitudinal section of a piston and cylinder, and

Fig. 2 is a sectional plan on the line a-a of Infthe construction illustrated air is admitted to the working cylinderl through an inlet passage 3 in the cylinder head con-y trolled by a valve 2/and additional air is also admitted through ports 5 lcontrolled by the piston 4. The ports 5 are arranged so that the air stream is deflected in a downward direction as shown by the arrow 6in Figure 1 towards a dish or trough-like depression 7 in the head of the piston 4. Air is supplied to the ports. 5 by a pipe 8, and a non-,return valve 9 is provided between the ports and the source of supply to prevent the outflow-of the products of combustion when the ports are rst opened. The waste products of combustion are exhausted through an exhaust lvalve 10 and fuel Aisi-admitted through a valve According to the invention air isadlnitted through the ports 5 at the commencement of each exhaust stroke and this air is tangential-- 'ly directed across the head o the piston 4 so that a whirling or circularmovement is imf haust valves may be controlled by any suitable means and theopening and closing of these valves can be regulated in accordance with working conditions.

It will be appreciated that the construction above described is` given by way of example only and may be modiiied withoutdeparting from the scope of the invention.

What I claim is: l In a four-stroke fuel-injection combustion engine, a cylinder and an air-inlet valvein the head thereof for. the main scavenging air,

a piston having a concave head, said cylinderv wall having downwardly` and tangentially opening ports therein for the admlssion of auxiliary scavenging air, said ports being nected to a mani-fold surrounding atleast a part of said cylinderrwall, a header connected to the outer end of said manifold by one side and a source Aof compressed air by the other side, and a non-return valve in said header for preventing products of combustion from entering the `source of com- -pressed air.

In testimony whereof I have afixed my signature.

KUNO EISENBURGER. 

